Hello,
I come to follow up on this post, to point out that I "managed" to recover my map, but not easily. First I have to tell you that this map contained just a "private property" with metal grids all around, to protect it, and a complete two story house, fully furnished, and of course all exterior and interior electricity. All this required a set containing almost 600 3D objects (575) ! So it was a "loss" that posed a problem for me.
In Max's current state of development, I figured I could never get anything back. I was mistaken
I zoomed out the map by positioning myself above the house. I could see the whole property. I selected the entire property with Shift, and created a group of 575 3D objects !
I memorized this huge group, and created a new map with the latest version of Max. Then, I flattened a lot accordingly to lay all the property on it. I was very surprised that Max knew how to do it !
However, here is the small list of issues I have experienced with this method.
1/ The Audio Zones that were in the map are still there, but they no longer work. There is no longer even a 5-sided stretch "spoke". I have to delete them to get new ones.
2/ All the electricity needs to be redone. The links between switches and Lights no longer exist.
3/ The 575 3D objects reappear in "Physics On" mode, and collision modes are active, including for outdoor plants. I had to delete them all, because the collision mode of the plants is impossible to change! Even by selecting "No collision", they have collisions which are imposed, and not editable.
4/ The Gravity was activated for all 575 3D objects, which gave me a small 30 FPS at the time of the first Test Game
5/ The Behaviors are all gone.
In short. Creating such a huge group may not be the best way to get a large part of the map. Because the "Group" forgets all the personalized parameters of the objects. However, thank you Max !